Chat with GLM 5.3 for free
GLM 5.3 is Z.ai's open-weight coding and agentic model, with always-on reasoning and a 1M-token context window for large codebases. Start typing, no sign-up needed.
See how GLM 5.3 thinks
Pick a task and watch a sample answer stream in. Open the same prompt in Chatday when you’re ready.
The bug is in the arrow body: u.id = id assigns instead of compares, so the callback returns the assigned value and .find never matches the way you expect.
Fix it with a strict comparison:
Use === to compare. A single = is assignment, which is why you saw undefined.
What makes GLM 5.3 stand out
GLM 5.3 specifications
| Provider | Z.ai |
| Model family | GLM 5 series |
| Context window | 1,000,000 tokens |
| Max output | 1,000,000 tokens |
| Modality | Text · Code |
| Input price | $1.4 / 1M tokens |
| Output price | $4.4 / 1M tokens |
| Tool / function calling | Yes |
| Vision | No |
| Streaming | Yes |
| Available in Chatday | Free & Pro |
Pricing shown for reference; usage is included in your Chatday plan.
GLM 5.3 vs other top models
| Model | Context | Best at | Input price | In Chatday |
|---|---|---|---|---|
| GLM 5.3 | 1M | Coding agent | $1.4/M | Free |
| Grok 4.6 | 500K | Agentic reasoning | $2/M | Free |
| Claude Opus 5 | 1M | Frontier agents | $5/M | Free |
| GPT-5.6 | 1.1M | Flagship reasoning | $2/M | Free |
GLM 5.3 questions
Other models
Grok 4.6
Grok 4.6 is xAI's flagship for long agentic runs, with self-checking on multi-step tasks and strong coding at half frontier prices.
Claude Opus 5
Claude Opus 5 is Anthropic's strongest Opus model: hybrid reasoning for long-running agents, serious coding and computer use.
GPT-5.6
GPT-5.6 is OpenAI's newest flagship for hard, multi-step reasoning, coding and tool use, the default when problems get genuinely difficult.
Chat with GLM 5.3 and switch models any time.
One subscription, every leading model. Start free in the Chatday web app.